﻿using Recipes.Model;
using Recipes.ViewModel;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace Recipes.Pages
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class SearchPage : Recipes.Common.LayoutAwarePage, INotifyPropertyChanged
    {
        private ObservableCollection<ShortRecipe> _searchedRecipes;
        /// <summary>
        /// Collezione da mostrare come risultato di una ricerca
        /// </summary>
        public ObservableCollection<ShortRecipe> SearchedRecipes
        {
            get { return _searchedRecipes; }
            set
            {
                _searchedRecipes = value;
                notifyPropertyChanged("SearchedRecipes");

            }
        }
        /// <summary>
        /// Costruttore della pagina di ricerca
        /// </summary>
        public SearchPage()
        {
            this.InitializeComponent();
            DataContext = this;
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
        }

        /// <summary>
        /// Metodo invocato quando si naviga alla pagina.
        /// Viene utilizzato per inizializzare gli oggetti da mostrare all'utente
        /// </summary>
        /// <param name="e"></param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            //Ottengo la stringa di ricerca
            string searchString = e.Parameter as string;
            if (!string.IsNullOrWhiteSpace(searchString) && App.downloadedRecipes != null)
            {
                //Se la stringa non è nulla e se ci sono delle ricette
                //Cerco tutte le ricette che corrispondono alla ricerca
                IList<Recipe> recipes = App.downloadedRecipes
                    .Where(x => x.Title.ToLower()
                        .Contains(searchString.ToLower()))
                        .Distinct().ToList();

                //Costruisco l'elenco delle ricette da mostrare
                IList<ShortRecipe> recToSet = new List<ShortRecipe>();
                foreach (var r in recipes)
                {
                    ShortRecipe sr = new ShortRecipe(r);
                    recToSet.Add(sr);
                }
                //Imposto le ricette
                SearchedRecipes = new ObservableCollection<ShortRecipe>(recToSet);
            }
        }

        /// <summary>        
        /// Metodo invocato quando l'utente tocca un elemento
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Element_Tapped(object sender, TappedRoutedEventArgs e)
        {
            Grid s = sender as Grid;
            Guid guid = (Guid)s.Tag;
            this.Frame.Navigate(typeof(Pages.RecipePage), guid);
        }

        /// <summary>
        /// Evento dell'interfaccia INotifyPropertyChanged
        /// Necessario per collegare la UI con il codice.
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;
        private void notifyPropertyChanged(string p)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(p));
        }
    }
}
